There are a couple cameos. One is a Tamagotchi, which is a keychain-sized virtual pet that was really popular in the 90s and 2000s. I added a human body underneath it for fun.

Others: Robot from Gunnerkrigg Court, and some protectrons from Fallout 3 (changed the colors a bit for those.) I almost added Mettaton from Undertale, and I wanted to add the Terminator and the robots from Interstellar, but I was getting tired of this page and drew generic robots instead ahah